Issue Summary: Electron-based apps cause a huge system-wide lag on macOS 26 Issue Details Issue Number: 48311 Repository: electron/electron Labels: 37-x-y, 38-x-y, bug 🪲, performance 🏁, platform/macOS Type: Bug Status: Open Linked Pull Request: #48376 Description Users report significant system-wide lag on macOS version 26 (codename Tahoe RC) when using Electron-based applications. The lag is especially notable on M1 Max MacBook Pro systems running arm64 architecture. Symptoms Huge lag when Electron-based apps like Discord or VS Code are open and not minimized. CPU and GPU usage remain low, but actions like moving windows and scrolling become stuttering or jittery. The lag persists even when switching focus to other apps (e.g., Chrome) if Electron apps remain open. Minimizing the Electron app (e.g., Discord) alleviates the lag. Similar lag observed when opening macOS Settings > Wallpapers. Issue appears only on macOS 26; earlier versions (macOS 15) had no such problem. The issue does not appear in Chromium or Google Chrome. Environment Electron version: 37.3.1 OS: macOS 26 Tahoe RC Architecture: arm64 including Apple Silicon Expected Behavior Smooth 120 FPS experience without performance degradation when Electron-based apps are open or active. Actual Behavior Severe lag and stuttering despite low CPU/GPU usage when Electron apps are running or in the foreground. Maintainer Update Maintainer MarshallOfSound recommends users experiencing this issue to file feedback through Apple's Feedback Assistant. Users should submit the feedback along with a sysdiagnose report while the lag issue is ongoing. The report is likely collected automatically but verify any required checkboxes. The problem is likely related to macOS itself rather than Electron. Additional Information No testcase gist or further information reported. Issue author followed contributing guidelines and code of conduct. No one assigned to the issue yet. No branches or pull requests currently addressing the issue aside from the linked PR. --- This issue reflects critical performance impacts for Electron-based applications under the latest macOS release candidate. The root cause is suspected to be within macOS, with community and maintainers advising submitting detailed feedback to Apple.